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Activated carbons for water treatment prepared by phosphoric acid activation of hydrothermally treated beer waste
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).ORCID-id: 0000-0002-4176-1899
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK). Biokol Lilliestråle & Co KB, Sweden.
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
2014 (Engelska)Ingår i: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 53, nr 40, s. 15389-15397Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Activated carbons were produced by chemical activation of hydrothermally carbonized (HTC) beer waste, withphosphoric acid as the activation agent. The activation was optimized within a full factorial design, using the outcome of 19different experiments. Four different parameters (concentration of the acid, activation time, activation temperature, flow rate)were analyzed with respect to their influence on the median pore size. The concentration of H3PO4 had a strong positive effecton the median pore size. The specific surface areas of these activated carbons were ∼1000 m2/g, which compared wellcommercially available activated carbons. The activated carbons had mostly large pores with a size of ∼4 nm, and a significantamount of acid surface groups. Scanning electron microscopy (SEM) revealed that the morphology of the HTC beer wastechanged significantly after the chemical activation. The capacity to adsorb methylene blue from aqueous solutions was 341 mg/g,for one of the activated carbons at pH 7. A Langmuir model described the uptake of the dye quite well, which suggested ahomogeneous adsorption of Methylene Blue (MB).

Ort, förlag, år, upplaga, sidor
2014. Vol. 53, nr 40, s. 15389-15397
Nationell ämneskategori
Materialkemi
Forskningsämne
materialkemi
Identifikatorer
URN: urn:nbn:se:su:diva-107670DOI: 10.1021/ie5004569ISI: 000343016500010OAI: oai:DiVA.org:su-107670DiVA, id: diva2:749325
Forskningsfinansiär
Berzelii Centre EXSELENTTillgänglig från: 2014-09-23 Skapad: 2014-09-23 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Refining of hydrochars/ hydrothermally carbonized biomass into activated carbons and their applications
Öppna denna publikation i ny flik eller fönster >>Refining of hydrochars/ hydrothermally carbonized biomass into activated carbons and their applications
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Hydrothermally treated biomass could not only be used as a fuel or a fertilizer but it can also be refined into high-value products. Activated carbons are one of those. In the studies of this thesis, four different hydrothermally carbonized (HTC) biomasses, including horse manure, grass cuttings, beer waste and biosludge, have been successfully made into activated carbons. The activated carbon materials were in the forms of powdered activated carbons, powdered composites of activated carbon and iron oxide nano-crystals, and activated carbon discs.

The HTC biomasses and the activated carbons were characterized and analyzed using several methods. The biomasses were carbonized to different extent during the hydrothermal treatment, which depended on the different natures of the biomasses. The HTC biomasses were activated into powdered activated carbons by both physical activation, using CO2, and by chemical activation, using H3PO4. Full factorial design matrices were applied to design experiments and study the influence of different parameters used during both physical and chemical activation. Activated carbons with embedded iron oxide nanoparticles were synthesized through hydrothermal carbonization followed by CO2 activation. These composites had high surface areas and showed a strong magnetism, and the powders could be separated from liquid phase by applying a magnetic field. Strong and dense activated carbon discs were also prepared from powdered HTC beer waste by pulsed current processing (PCP) and a subsequent CO2 activation procedure. The potential for carbon dioxide separation from nitrogen, and methylene blue adsorption in aqueous solution, were assessed for the powdered activated carbons produced from HTC biomasses. They showed good performance in both applications. 

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2014. s. 68
Nyckelord
Hydrothermally carbonized biomass, activated carbon, full factorial design, activated carbon disc, nanoparticles, iron oxide, CO2 separation, methylene blue, adsorption
Nationell ämneskategori
Materialkemi
Forskningsämne
materialkemi
Identifikatorer
urn:nbn:se:su:diva-107672 (URN)978-91-7447-994-2 (ISBN)
Disputation
2014-11-18, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Berzelii Centre EXSELENT
Anmärkning

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 1: In press.

Tillgänglig från: 2014-10-27 Skapad: 2014-09-23 Senast uppdaterad: 2015-05-07Bibliografiskt granskad

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Hao, WenmingHedin, Niklas
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Institutionen för material- och miljökemi (MMK)
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Industrial & Engineering Chemistry Research
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